在通过DBCA来创建Oracle数据库或删除已有数据库的时候。下面来主要说明创建数据库。至于General Databaes(一般用途)的选项,那
在通过DBCA来创建Oracle数据库或删除已有数据库的时候。下面来主要说明创建数据库。
在创建数据库的时候,一般会给你提供三种数据库模板(就是数据库类型):
一般用途:General Database
事物处理:Transaction Processing
数据仓库:Data Warehouse
定制数据库:Custom Database
下面就Ceneral Database, Transaction Processing,Data WareHouse,即一般用途,事物处理,数据仓库来分别比较说明:
事物处理的英文单词是Online Transaction Processing,简称OLTP,通常意义上是指那些短事物,高并发,读写频繁的数据库系统,数据仓库又被称为Online Analysis Processing ,简称OLAP,是指那些长事物,低并发,多读而少写的数据库系统。
理论上说,oracle数据库中大多数参数在后期是可调的,但也有一些参数一旦创建后期无法调整,比如DB_BLOCK_SIZE,即块大小,,在oracle数据库中是非常重要的一个参数,恰好这个参数在OLTP和OLAP两种类型应用中需求不一致,对于OLTP数据库,数据库常处于小数据量,频繁读写状态,对于这种系统一般不会将DB_BLOCK_SIZE设置太大,以免读写时I/O浪费;而对OLAP数据库,由于系统处于大量数据库的多度而少写状态,因此DB_BLOCK_SIZE设置较大,比如32K。也就是说两种数据库类型的某些层面从定义上是相对立的,如果你能确认你的数据库类型,可以选择Transaction Processing(事物处理)和Data Warehouse(数据仓库)。
至于General Databaes(一般用途)的选项,那是来唬外行的,绝对不建议选择,但是对于一些初学者来说可以试着玩玩,没什么问题的。不多对于业务类型不是特别清除的,想对oracle数据库有一定了解的建议选择Custom Database(定制数据库)来玩玩。

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